chore: fix lint

lib/manager/npm/extract/index.js

@@ -23,6 +23,7 @@ async function extractDependencies(content, packageFile, config) {
     logger.info({ packageFile }, 'Invalid JSON');
     return null;
   }
+  // eslint-disable-next-line no-underscore-dangle
   if (packageJson._id && packageJson._args && packageJson._from) {
     logger.info('Ignoring vendorised package.json');
     return null;